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Old 05-05-2014, 11:46 PM   #21
twistedtree's Avatar
City: Walkabout Creek
Join Date: Jan 2013
Posts: 7,572
Were you near a bridge or other obstruction? I was at a marina in Charleston right near a bridge and my GPS was going totally wacky. It turned out it was continually losing and reacquiring the satellites. As soon as I moved away from teh bridge it became stable again. I guess they mean it when they say you need a clear view of the sky.....
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Old 05-06-2014, 09:30 AM   #22
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City: West Coast
Join Date: Apr 2014
Posts: 1,595
Probably not SA

Originally Posted by AKFish View Post
I didn't think that selective availability would effect me but it looks like my biggest concern with this tech has appeared.
I believe that SA has been turned off, but would no doubt be reactivated in time of emergency. And it is probably tested periodically, although I leave my plotter running 24/7 and my boat's position is very stable, so the signal can't be degraded very often.

Moreover, the SC doesn't depend on absolute accuracy to determine heading.
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